Watch and act for Vic grass fires

By AAP Newswire

Residents in northern Victoria have been told stay close to shelter as a number of out-of-control grass fires threaten the area.

A watch and act alert has been issued for suburbs for Byrneside, Gillieston, Harston, Merrigum and Mooroopna North West near Shepparton, in the state's north, with residents told to seek shelter.

"Firefighters have not been able to stop the spread of the fire. Staying close to shelter is the safest option, in case conditions change again suddenly," the Country Fire Authority said in an alert issued on Tuesday.